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-/*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
- * http://www.musicpd.org
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-/** \file
- *
- * This header declares the db_plugin class. It describes a
- * plugin API for databases of song metadata.
- */
-
-#ifndef MPD_DATABASE_PLUGIN_HXX
-#define MPD_DATABASE_PLUGIN_HXX
-
-#include "DatabaseVisitor.hxx"
-#include "tag/TagType.h"
-#include "Compiler.h"
-
-#include <time.h>
-
-struct config_param;
-struct DatabaseSelection;
-struct db_visitor;
-struct LightSong;
-class Error;
-class EventLoop;
-class DatabaseListener;
-
-struct DatabaseStats {
- /**
- * Number of songs.
- */
- unsigned song_count;
-
- /**
- * Total duration of all songs (in seconds).
- */
- unsigned long total_duration;
-
- /**
- * Number of distinct artist names.
- */
- unsigned artist_count;
-
- /**
- * Number of distinct album names.
- */
- unsigned album_count;
-
- void Clear() {
- song_count = 0;
- total_duration = 0;
- artist_count = album_count = 0;
- }
-};
-
-class Database {
-public:
- /**
- * Free instance data.
- */
- virtual ~Database() {}
-
- /**
- * Open the database. Read it into memory if applicable.
- */
- virtual bool Open(gcc_unused Error &error) {
- return true;
- }
-
- /**
- * Close the database, free allocated memory.
- */
- virtual void Close() {}
-
- /**
- * Look up a song (including tag data) in the database. When
- * you don't need this anymore, call ReturnSong().
- *
- * @param uri_utf8 the URI of the song within the music
- * directory (UTF-8)
- */
- virtual const LightSong *GetSong(const char *uri_utf8,
- Error &error) const = 0;
-
- /**
- * Mark the song object as "unused". Call this on objects
- * returned by GetSong().
- */
- virtual void ReturnSong(const LightSong *song) const = 0;
-
- /**
- * Visit the selected entities.
- */
- virtual bool Visit(const DatabaseSelection &selection,
- VisitDirectory visit_directory,
- VisitSong visit_song,
- VisitPlaylist visit_playlist,
- Error &error) const = 0;
-
- bool Visit(const DatabaseSelection &selection,
- VisitDirectory visit_directory,
- VisitSong visit_song,
- Error &error) const {
- return Visit(selection, visit_directory, visit_song,
- VisitPlaylist(), error);
- }
-
- bool Visit(const DatabaseSelection &selection, VisitSong visit_song,
- Error &error) const {
- return Visit(selection, VisitDirectory(), visit_song, error);
- }
-
- /**
- * Visit all unique tag values.
- */
- virtual bool VisitUniqueTags(const DatabaseSelection &selection,
- TagType tag_type,
- VisitString visit_string,
- Error &error) const = 0;
-
- virtual bool GetStats(const DatabaseSelection &selection,
- DatabaseStats &stats,
- Error &error) const = 0;
-
- /**
- * Returns the time stamp of the last database update.
- * Returns 0 if that is not not known/available.
- */
- gcc_pure
- virtual time_t GetUpdateStamp() const = 0;
-};
-
-struct DatabasePlugin {
- const char *name;
-
- /**
- * Allocates and configures a database.
- */
- Database *(*create)(EventLoop &loop, DatabaseListener &listener,
- const config_param &param,
- Error &error);
-};
-
-#endif